>>112544552A lot of FF villains would be great Superman villains and some Superman villains would be perfect for FF.
Galactus and heralds would be really good matches for Superman, especially some of the recurring villain ones like Terrax and Airwalker.
Doom using his doombots and magic would do a little better against Superman, plus his things like cosmic powers device and constant collecting objects of power he might do better against Superman in a fight.
Ronan and the Kree as well as Super Skrull would be good fights for Superman too
Brainiac would be a great villain for the FF, as someone who can physically match the team and intellectually match Reed.
Luthor would be a better main rival as someone who is also inventing super advanced machines apart from Reed, but has the sense to make a financial empire out of his inventions. Lex might see Reed as more of a rival than Reed would view him.
Parasite would do well against the FF most of the time
Henshaw is a better evil opposite of the FF, especially if his crew survives and they make an evil team.